CBQE-2135: full kv-ejection test cases

initial tests to verify that evicted items can be retrieved and also are purged when expired

Change-Id: I509b4b48cebd5dcae4df9be1973f5f92f7ee521b
Reviewed-on: http://review.couchbase.org/34791
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Tommie McAfee <tommie@couchbase.com>